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METAL POIUNDING MAGHINB. N0. 369,214. Patented Aug. 30, 1887.

Witnesses NW &

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Attorney N PETERS, Photo-U nnn n nn r, Washi n n. c

UNITED STATES PATENT O ICE.

HARRIS, TABOR, NEW YORK, N. Y., ASSIGNOR TO THE TAB-OR MANUFACTURING COMPANY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent 170369.214, dated August so, 1887.

Application filed January 25, 1886. Serial No. 189,569. (No model.)

To all whom it may concern:

Be it known that I, HARRIS TABOR, of New York, New York county, New York, have invented certain new and useful Improvements in Metal-Founding Machines, of which the following is a specification.

This invention pertains to machinery for use by the foundryman in ramming or compacting the sand in his molds, and the improvements IO will be readily understood from the following.

' r5 tical section through the plunger-box; Fig. 3,

a vertical diametrical section, upon an enlarged scale, through one of the bores of the plunger-box; and Fig. 4., a View of the bottom face of the box-cover.

In the drawings, A' indicates the base or table of the machine, of a size adapted to receive such flasks as the machine is intended to operate upon; B, a pair of vertical guides rising therefrom and having downwardlypresenting ratchet-teeth upon their inner faces;

0, a box-like structure, herein termed the plunger-box, adapted to reciprocate vertically in the guides; D, compactly grouped vertical boresin the plunger-box; E, the coverplate of the plunger-box; F, two pipes connected to the cover-plate, one of the pipes being intended for the conveyance to the machine of steam, water, air, or other pressure medium, and the other for the exhaust. of the same, these pipes to be provided with valves which can be opened and closed; G, grooves in the lower face -of the cover-plate, placing pipes Fin communication with all of the bores D; H, plungers, one for each of the bores of the plunger-box, the lower end of these plungers being provided with convex-faced rammer-heads to engage the sand to be compacted; I, in Fig. 2, one of the marginal plungers of the group, endowed with superior ramming power by reason of its having an enlarged piston area; J, in Fig. 2, one of the marginal plungersof the group, endowed with superior ramming power by reason of its rammer-head having a decreased area; K, a'drip-pan dis- 50 posed below the plungers, and having nipples K surrounding the plungers and protruding upward into the bores; L, a molders flask, with its bottom board, L, in position in the machine; M, a sand-box surmounting the flask, this sand-box being substantially a re movable upper extension of the flask; N, a motor-cylinder vertically disposed over the machine and supported by a cross-piece at the top of the guides, and furnished with a valve by which air or other pressure medium may be admitted to and exhausted from it; 0, the piston-rod of the motor-cylinder, this red terminating below in a head secured to the cover-plate of the plunger-box, but adapted to have a certain amount of vertical play with reference to the cover-plate; P, a pair of pawls pivoted to the cover-plate E and adapted to engage the ratchet-teeth of the guides; Q, toggle-links pivoted to the piston-rod of the motorcylinder andto the pawls; R, abridle secured to the top of the plunger-box, the piston-rod O passing through this bridle; and S, a collar or head upon the lower end of the piston-rod, engaging below the bridle and permitting the piston-rod to reciprocate sufficiently in the bridle to withdraw the pawls P.

In Fig. 1 I have shown the machine asengaged in ramming a complete flaskthat IS, I show both the drag and cope of the flask in position. As a general rule, matchplate patterns will be used, and each portion of the flask will be rammed separately.

The flask and sand-box, or the flask alone,

the sand-boxbeing omitted, being filled with sand, and air, steam, or water, under pressure, being admitted to the plunger-box, it is obvi-, ous that the plungers will be forced downward and the sand thoroughly compacted,and that each of the plungers will act independent of its fellows, thus enabling the multiple rammer to accommodate itself to any inequality of pattern configuration and to apply an equal pressure at all parts of the rammed surface.

It is obvious that the insides of the flask will offer a certain amount of frictional resistance to the downward movement of the sand. To compensate for this I provide that the marginal plungers of the group shall have a superior ramming power, accomplished either by 100 increasing the piston area or by decreasing the ramming area of the marginal plungers, as clearly illustrated in Fig. 2.

The grooving of the cover-plate permits the distribution of the pressure medium to all of the plungers with the least possible amount of waste by clearance. The pan K is for use when water or steam is employed as the pressure medium, this pan serving to catch the drip due to the leakage of the plungers,and to prevent the same from reaching the sand. The pan may be drained to a cesspool or elsewhere. o

The rammers are screwed to the plungers and are removable therefrom, as indicated in Fig. 3. This permits the removal of as many of the outside rows of plungers as is desired to adapt the machine to smaller sized flasks.

The upward retreat of the plunger-box is prevented by the pawls engaging the guideratchets. If air or other pressure medium be admitted under the motor-cylinder, the pistonrod 0 will rise and its first action will be to withdraw the pawls from engagement with the ratchets, after which it will lift the plungerbox bodily as far as desired, and thus permit the ready filling of the flask, or the removal of the flask. When the pressure medium is allowed to exhaust from below the motor-piston, the plunger-box will again de-' scend and the pawls engage the ratehets.

If pressure be applied above the motorpiston, the plunger-box will be forced downward with a force dependent upon the area of the motor-cylinder and the pressure applied thereto. place, air or other pressure medium be confined in the plunger-box, it is evident that the ramming of the sand will be effected virtually by means of the motor-piston, and that the group of plungers form a multiple rammer, which will adapt itself to irregularities of pattern configuration and compact the sand uniformly at all points. By causing more or less rapid reciprocations of the motor-piston the ramming of the sand may be effected by a succession of blows, should such action be preferred to the steady pressure. Any mechanism which will serve in elevating orin reciproeating the plunger-box will perform fully the functions of the motor-cylinder.

I have illustrated the machine as being vertically disposed; but it may be disposed angularly, horizontally, or in a reverse position, and, if desired, devices may be added for reciprocating the table-surface on which the flask rests while it is being rammed, as is common in metal-founding machines.

The operation of my machine is as follows: Theplunger-box is elevated, the bottom board, with the usual half-pattern upon it, placed in the machine, one half of the flask placed over the bottom board, the sand-box placed over the half-flask, if deemed necessary, the halfflask and sand-box filled with sand in any convenient manner, the pressure admitted to the plunger-box, the plunger-box lowered,

If, when this downward forcing takes thus compacting the sand, pressure admitted to the motor-cylinder to produce a further compacting, should such be desired, the pressure cut off from the plunger'box, the plunger-box elevated by the action of the motorcylinder, the flask and bottom board removed, the half-flask flushed at its top with sand, if needed, the half-flask turned over in the ma chine, parting-sand applied as usual, the other half of the pattern applied, the cope applied, sprue-pins set, and the filling and ramming again proceeded with, after which the mold 1s to be removed and opened and the pattern drawn, 850. After the plunger-box has descended upon the sand, it may be caused to rise and fall by the action of the motor-cylinder, and thereby effect the ramming by impact. \Vhere patterns are not parted,it is obvious that a match-board will be employed, as or upon the bottom board. In the case of patterns attached to the opposite sides of parting-plateathe two halves of the flasks may be rammed similarly and independently, a suitable follow-board being employed, as or upon the bottom board.

I contemplate embodying the characteristic features of my machine in connection with molding-machines adapted for the mechanical drawing of the patterns, &c.; but these latter features form no part of the present inven tion.

Mention should be made of the fact that sand-molding machines have been heretofore devised in which a group of heavy rammers have been arranged in a gate so as to be lifted and allowed to fall and ram the sand; also, a ramming-surface formed of flexible bags distended by pressure medium within them; also, a reciprocating ramming-plate having independently-reeiprocating parts over the patterns; also, a ramming-plate having a ramm1ngsurface forming a counterpart of the pattern. I disclaim such devices and do not employ them.

I claim as my invcntion- 1. In a metal-founding machine, the combination, with a flask-supporting table, a multibore plunger-box disposed opposite thereto, and mechanism for pressing them together, of a group of rammers fitted to reciprocate in the bores of said plunger-box, and an inlet and outlet to said plunger-box for air or other pressure medium, substantially as and for the purpose set forth.

2. In a metal-founding machine, the combinationof a flask-supportin g table, a plungerbox disposed opposite thereto, an inlet and outlet to said plunger-box for air or other pressure medium, a group of rammers fitted to reciprocate in said plunger-box, and a drippan disposed below said plunger-box and provided with upwardly-projecting nipples encircling the individual rammers, substantially as and for the purpose set forth.

3. In a metal-founding machine, the combination of a flask-supporting table, a multibore plunger-box disposed opposite thereto, a

and for the purpose set forth.

4:. In a metal-founding machine, the com bination, with a flask-supporting table, a re ciprocating plunger-box, an inlet and outlet to said plunger-box for air or other pressure medium, a group of rammers fitted to reciprocate in said plunger-box, and mechanism V for reciprocating said plunger-box, of a rod for transmitting motion from such mechanism to the plunger-box, a pair of ratchets secured to the table, pawls pivoted to the plunger-box, and links connecting the pawls with said rod, substantially as and for the purpose set forth.

5. In a metal-founding machine, the combination of a flask-supporting table, a reciprocating multibore plunger-box disposed opposite thereto, an inlet and outlet to said plunger-box for air or other pressure medium, a group of rammers fitted to reciprocate in the bores of said plunger-box, and a motor-cylinder disposed over said plunger-box and adapted to serve in reciprocating the same, substantially as and for the purpose set forth.

6. In a metal-founding machine, the combination of table A, ratcheted guides B, rising therefrom, plunger-box 0, group of plungers H, motor-cylinder N, piston-rod O, pawls P, and links Q, substantially as and for the purpose set forth.

HARRIS TABOR.

Witnesses:

S. D. WADHAMS, D. W. PAYNE. 

